[glibc/azanella/mips-hw-fp-round] mips: Implement floorf with hardware floating-point rounding instruction

[glibc/azanella/mips-hw-fp-round] mips: Implement floorf with hardware floating-point rounding instruction

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=16da0a4727b145ae384b791839821c294eee1626

commit 16da0a4727b145ae384b791839821c294eee1626
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Dec 27 08:56:48 2023 -0300

    mips: Implement floorf with hardware floating-point rounding instruction

Diff:
---
 sysdeps/mips/fpu/roundf_to_integer.h |  4 ++++
 sysdeps/mips/fpu/s_floorf.c          | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/sysdeps/mips/fpu/roundf_to_integer.h b/sysdeps/mips/fpu/roundf_to_integer.h
index 49f5960f24..089322072e 100644
--- a/sysdeps/mips/fpu/roundf_to_integer.h
+++ b/sysdeps/mips/fpu/roundf_to_integer.h
@@ -26,6 +26,7 @@
 enum round_mode
 {
   CEIL,
+  FLOOR,
 };
 
 static inline float
@@ -43,6 +44,9 @@ round_to_integer_float (enum round_mode mode, float x)
   case CEIL:
     asm ("ceil.l.s %0, %0" : "+f" (r));
     break;
+  case FLOOR:
+    asm ("floor.l.s %0, %0" : "+f" (r));
+    break;
   }
   libc_fesetenvf (&fe);
 
diff --git a/sysdeps/mips/fpu/s_floorf.c b/sysdeps/mips/fpu/s_floorf.c
new file mode 100644
index 0000000000..e9f152eb42
--- /dev/null
+++ b/sysdeps/mips/fpu/s_floorf.c
@@ -0,0 +1,36 @@
+/* Round to nearest integer, away from zero.  MIPS version.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#if ((__mips_fpr == 64) \
+      && (__mips_hard_float == 1) \
+      && ((__mips == 32 && __mips_isa_rev > 1) || __mips == 64))
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <roundf_to_integer.h>
+#include <libm-alias-float.h>
+
+float
+__floorf (float x)
+{
+  return round_to_integer_float (FLOOR, x);
+}
+libm_alias_float (__floor, floor)
+#else
+# include <sysdeps/ieee754/flt-32/s_floorf.c>
+#endif